package com.atguigu.gulimall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.to.es.SkuEsModel;
import com.atguigu.common.utils.R;
import com.atguigu.gulimall.search.config.GulimallElasticsearchConfig;
import com.atguigu.gulimall.search.constant.EsConstant;
import com.atguigu.gulimall.search.feign.ProductFeignService;
import com.atguigu.gulimall.search.service.MallSearchService;
import com.atguigu.gulimall.search.vo.AttrResponseVo;
import com.atguigu.gulimall.search.vo.BrandVo;
import com.atguigu.gulimall.search.vo.SearchParam;
import com.atguigu.gulimall.search.vo.SearchResult;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.BoolQueryBuilder;
import org.elasticsearch.index.query.NestedQueryBuilder;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.RangeQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.CollectionUtils;
import org.springframework.util.StringUtils;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @Author : Jungle
 * @Description :
 */
@Service
public class MallSearchServiceImpl implements MallSearchService {
    @Autowired
    private RestHighLevelClient client;

    @Autowired
    private ProductFeignService productFeignService;


    @Override
    public SearchResult search(SearchParam param) {
        SearchResult result = null;
        //1.动态构建出查询需要的DSL语句
        //1、准备检索请求
        //SearchRequest searchRequest = new SearchRequest();
        SearchRequest searchRequest = buildSearchRequest(param);
        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, GulimallElasticsearchConfig.COMMON_OPTIONS);
            //3、分析响应数据封装成我们需要的指定格式
            result = buildSearchResult(response, param);

        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 准备检索请求
     * #模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存），排序，分页，高亮，聚合分析
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {
        //构建DSL语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        /**
         * 查询：模糊匹配,过滤（按照属性,分类，品牌,价格区间，库存)
         */
        //1、构建bool- query
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        //1.1、must-模糊匹配
        if (!StringUtils.isEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2、bool- filter    按照三级分类查询  Long型直接判空
        if (param.getCatalog3Id() != null) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2、bool- filter  按照品牌id进行查询  多个id
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termQuery("brandId", param.getBrandId()));
        }
        // 1.2、bool- filter  按照所有指定的属性进行查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            for (String attrStr : param.getAttrs()) {
                BoolQueryBuilder nestedBoolQuery = QueryBuilders.boolQuery();
                //attrs=1_5寸:8寸
                String[] s = attrStr.split("_");
                //检索的属性id
                String attrId = s[0];
                //这个属性检索用的值
                String[] attrValues = s[1].split(":");
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestedBoolQuery.must(QueryBuilders.termQuery("attrs.attrValue", attrValues));

                /**
                 * ScoreMode.None  评分模式
                 * 每一个都必须生成一个nested查询
                 */
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestedBoolQuery, ScoreMode.None);
                //attrs=1_5寸:8寸&attrs=2_16G:8G
                boolQuery.filter(nestedQuery);
            }
        }
        //1.2、bool- filter  按照库存是否有进行查询
        if (param.getHasStock() != null) {
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2、bool- filter  按照价格区间进行检索
        if (!StringUtils.isEmpty(param.getSkuPrice())) {
            //skuPrice=1_500/_5e00/500_  自定义价格区间  1-100/500以内/大于500   收尾输入框输入的值
            RangeQueryBuilder rangeQuery = QueryBuilders.rangeQuery("skuPrice");
            //分隔符
            String skuPriceSeparator = "_";
            String[] s = param.getSkuPrice().split(skuPriceSeparator);
            if (s.length == 2) {
                //区间
                rangeQuery.gte(s[0]).lte(s[1]);
                //大于或者小于
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith(skuPriceSeparator)) {
                    rangeQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith(skuPriceSeparator)) {
                    rangeQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangeQuery);

        }

        //把以前所有的条件都拿来封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        // 2.1、排序
        if (!StringUtils.isEmpty(param.getSort())) {
            String sort = param.getSort();
            //sort=saleCount_asc/desc
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        // 2.2、分页
        //pageNum : 1  from: 0 size : 5  [ 0,1 ,2,3,4]
        // pageNum : 2  from : 5  size : 5
        //from = ( pageNum-1 )*size
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);
        // 2.3、高亮 --前提必须要有关键字
        if (!StringUtils.isEmpty(param.getKeyword())) {
            HighlightBuilder builder = new HighlightBuilder();
            builder.field("skuTitle");
            builder.preTags("<b style='color:red'>");
            builder.postTags("</b>");
            sourceBuilder.highlighter(builder);
        }
        /**
         * 聚合分析
         */
        //1、品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //1.1、品牌聚合的子聚合
        //  一个id只能有一个名字一个图片
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        // TODO: 1、聚合品牌信息
        sourceBuilder.aggregation(brand_agg);
        //2、分类聚合
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(20);
        //2.1、分类聚合的子聚合
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        // TODO: 2、聚合分类信息
        sourceBuilder.aggregation(catalog_agg);

        //3、属性聚合 attr_agg
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        //3.1 一级子聚合   聚合分析出当前所有的attrId
        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(10);
        //3.2 聚合分析出当前attr_id 对应的名字
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1));
        //3.2 聚合分析出当前attr_id 对应的值
        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        //小聚合放到大聚合
        attr_agg.subAggregation(attr_id_agg);
        //大聚合放 sourceBuilder
        // TODO: 3、聚合属性信息
        sourceBuilder.aggregation(attr_agg);
        String s = sourceBuilder.toString();
        System.out.printf("构建DSL==>%3s \n", s);
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);
        return searchRequest;

    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildSearchResult(SearchResponse response, SearchParam param) {
        SearchResult result = new SearchResult();
        //1、返回所有查询到的商品信息
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModels = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                //转成对象
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                if (!StringUtils.isEmpty(param.getKeyword())) {
                    HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModels.add(esModel);
            }
        }
        result.setProducts(esModels);


        ////2、当前所有的商品涉及的属性信息
        List<SearchResult.AttrVo> attrVos = new ArrayList<>();
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            //2、得到属性的名字 一个名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            //3、得到属性的所有值  多个值，需要遍历
            List<String> attrValues = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream()
                    .map(item -> item.getKeyAsString()).collect(Collectors.toList());
            attrVo.setAttrId(attrId);
            attrVo.setAttrName(attrName);
            attrVo.setAttrValue(attrValues);

            attrVos.add(attrVo);
        }

        result.setAttrs(attrVos);
        ////3、当前所有的商品涉及的品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            //2、得到品牌的名字  都只有一个
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            //3、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            //封装brandVo
            brandVo.setBrandId(brandId);
            brandVo.setBrandName(brandName);
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }
        result.setBrands(brandVos);
        //4、当前所有的商品涉及的分类信息
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        List<? extends Terms.Bucket> buckets = catalog_agg.getBuckets();
        for (Terms.Bucket bucket : buckets) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类的id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));

            //得到分类名
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }
        result.setCatalogs(catalogVos);

        //===============以上从聚合信息中获取=================
        //5、分页信息-页码
        result.setPageNum(param.getPageNum());
        //5、分页信息-总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
        //5、分页信息-总页码  计算 11/2 = 5 ..1
        int totalPages = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ? (int) total / EsConstant.PRODUCT_PAGESIZE : (int) total / EsConstant.PRODUCT_PAGESIZE + 1;
        result.setTotalPages(totalPages);
        List<Integer> pageNavs = new ArrayList<>();
        //注意这里从1开始
        for (int i = 1; i < totalPages; i++) {
            pageNavs.add(i);
        }
        result.setPageNavs(pageNavs);
        //6、构建面包屑导航功能
        if (!CollectionUtils.isEmpty(param.getAttrs())) {
            List<SearchResult.NavVo> collect = param.getAttrs().stream().map(attr -> {
                //1、分析每一个attr传过来的查询参数值
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //attrs=1_其他:安卓&attrs=2_5寸:6寸
                String[] s = attr.split("_");
                //取后面一个值
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {
                    });
                    navVo.setNavName(data.getAttrName());
                } else {
                    //如果失败了这里调用属性的id作为名字
                    navVo.setNavName(s[0]);
                }
                //2、取消了面包屑要跳转到哪个地方，将请求地址的url里面的当前条件替换掉（置空）
                //    拿到所有的查询条件，去掉当前
                //attrs=7_麒麟
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());

            result.setNavs(collect);
        }
        //品牌，分类
        if (param.getBrandId() != null && param.getBrandId().size() > 0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            // 远程查询所有的品牌
            R r = productFeignService.brandsInfo(param.getBrandId());
            if (r.getCode() == 0) {
                //这个返回的属性可以比实际数据少BrandVo 比实际数据 BrandEntity 要少
                List<BrandVo> brand = r.getData("brand", new TypeReference<List<BrandVo>>() {
                });
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brand) {
                    buffer.append(brandVo.getBrandName() + ";");
                   replace = replaceQueryString(param, brandVo.getBrandId()+"", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.gulimall.com/list.html?" + replace);


            }
            navs.add(navVo);

        }
        // TODO: 2022/1/23 分类：不需要导航取消
        //result

        return result;
    }
    
    /**
     * 编码替换
     *  去掉添加的筛选条件，类似返回上添加面包屑之前的结果
     *
     * @param param
     * @param value
     * @param key   替换的那个key
     * @return java.lang.String
     */
    private String replaceQueryString(SearchParam param, String value, String key) {
        String encode = null;
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            //浏览器对空格的编码和java不一样  当属性中有空格的时候java会变成+号
            encode = encode.replace("+", "%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return param.get_queryString().replace("&" + key + "=" + encode, "");
    }
}
